Definition df-dm 3178

Description: Define the domain of a class. Definition 3 of [Suppes] p. 59.

Assertion

Ref	Expression
df-dm	|- dom A = {x | E.y xAy}

Distinct variable group:   x,y,A

Detailed syntax breakdown of Definition df-dm

Step	Hyp	Ref	Expression
1		cA	. . 3 class A
2	1	cdm 3160	. 2 class dom A
3		vx	. . . . . 6 set x
4	3	cv 952	. . . . 5 class x
5		vy	. . . . . 6 set y
6	5	cv 952	. . . . 5 class y
7	4, 6, 1	wbr 2609	. . . 4 wff xAy
8	7, 5	wex 977	. . 3 wff E.y xAy
9	8, 3	cab 1456	. 2 class {x | E.y xAy}
10	2, 9	wceq 953	1 wff dom A = {x | E.y xAy}

This definition is referenced by:  dfdm3 3291  dfrn2 3292  dfdm4 3294  eldm 3296  dmi 3315  dm0rn0 3319  dmcoss 3347

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